用括号内所给单词的正确形式填空.Tom ____ (mend) a bike now.

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用括号内所给单词的正确形式填空.Tom ____ (mend) a bike now.
用括号内所给单词的正确形式填空.Tom ____ (mend) a bike now.

用括号内所给单词的正确形式填空.Tom ____ (mend) a bike now.
Tom _is mending___ (mend) a bike now.

is mending

is mending

is mending